import java.util.Scanner;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User:26554
 * Date:2024-11-06
 * Time:23:02
 */
public class Text {
    public static double avg(int[]array,int x){
        double sum = 0;
        for (int i = 0; i < x; i++) {
            sum+=array[i];
        }
        return sum*1.0/x;
    }
    public static void main(String[] args) {
        Scanner san = new Scanner(System.in);
        int n = san.nextInt();
        int[] array = new int[n];
        for (int i = 0; i < array.length; i++) {
            array[i] = san.nextInt();
        }
        double m = avg(array,array.length);
        System.out.println(m);
    }
}
